Substituted cinnamamide derivative, preparation method and use thereof

A compound of a general formula (I) or its pharmaceutically acceptable acid addition salts:

• wherein:
• (i) R1 is F, Cl, Br, I, OCF3, OCHF2, OCH2F, CF3, CHF2, CH2F, CH3, CH3CH2, CF3CH2, NO2,
• n represents 0 or 1, and the unit of
• represents carbon-carbon single or double bond;
• X is ═O;
• Y is NR3, wherein said R3 is H, C1˜C10 straight chain hydrocarbyl;
• C3˜C10 branched chain hydrocarbyl, and
• R2 is H, C1˜C10 straight chain hydrocarbyl, C3˜C10 branched chain hydrocarbyl group;
• or
• Y is N and R2 is a group which forms piperidyl group with the neighboring Y;
• or
• (ii) R1 is F, Cl, Br, I, OCH3, OCF3, OCHF2, OCH2F, CF3, CHF2, CH2F, CH3, CH3CH2, CF3CH2, NO2;
• n represents 2, and the unit of
• represents carbon-carbon single or double bond;
• X is ═O;
• Y is NR3, wherein said R3 is H, C1˜C10 straight chain hydrocarbyl;
• C3˜C10 branched chain hydrocarbyl;
• R2 is H, C1˜C10 straight chain hydrocarbyl, C3˜C10 branched chain hydrocarbyl group.